And in the last 10 years, Seth Shapiro was as a member of two influential Manhattan fashion collectives before launching his own American Manufacturing line.

While familiar to fashion-world insiders, these names are far from Calvin-sized.

That might just change in two weeks, when the three thirtysomethings show their fall 2001 lines to 1,000 store owners, fashion stylists and magazine editors as part of the fifth annual Designer Debut, sponsored by Moet & Chandon — a company better known for Champagne than fashion.

The debut will take place on Sunday, Feb. 11, during the 7th on Sixth New York Fashion Week shows at Bryant Park.

Though the show is often touted as a way for young designers to show their clothes before a large and influential audience, Ganeaux is already a star among in-the-know fashionistas who love her slim-fitting, outrageously flattering trousers, which the New York City native has sold from her own SoHo store for the last two years.

The designer, who’s currently pregnant with her second child, is mum on what might be seen in her first runway show, except that she uses a good bit of sporty and menswear fabrics.

“My things are fairly classic and sexy,” says Ganeaux, 36, whose line also features suits, jackets, skirts and coats. “The designs really don’t change from season to season that much.”

Jimenez’s creations, however, change from piece to piece. A schooled sculptor, Jimenez treats fabric like clay, strategically “molding” and sewing it directly on the wearer’s body into a one-of-a-kind piece of art.

The Dallas native’s highly individualized clothes are currently on show at the famed Holly Solomon Gallery and were included in the Metropolitan Museum of Art Costume Institute’s recent “Rock Style” exhibit.

The 36-year-old mom of one has sewn in front of large groups of people (and she leads 40-woman “sew-ins” at the gallery), but Jimenez’s “Cosmology and Flesh” collection will be her first runway show.

For a rising star, she’s not much of a self-promoter. “I’ve been shy about it,” she says. “I wanted to be protective of what I do. But I realize now that the universe gave me this [talent] as a blessing, and to be covetous of it would be wrong.”

As a former member of two downtown design collectives, Shapiro knows a good bit about sharing.

The California-born designer once made clothes by committee as a member of the Organization of Returning Fashion Interest (ORFI) and the Bernadette Corp. But as the sole designer of the two-year-old label American Manufacturing, Shapiro has total creative control.

“Every collection I have tells a story about how those clothes are made,” he explains.

The line he’ll show at the Debut show is based on the famous scene from “Gone With the Wind” when Scarlet O’Hara tears down the living room drapes and makes a gown.

“It’s about the ceremony of clothing,” explains Shapiro, who is 31. “Even though her life is devastated by war, she knows she needs that dress to wear to meet the love of her life. She realizes that she can take whatever she has on hand and make a gorgeous dress.

“That scene really is my story,” he continues. “And it’s a lot of young people’s stories nowadays: (-ssq-)I have dreams. I have no money, but I want to redefine quality and what’s beautiful. And I can do it on my own.'”

This will be the fifth fashion season the 258-year-old French wine house has hosted the group show — a major boon to emerging talent.

Putting on their own shows could cost these designers anywhere from $50,000 to $250,000 — that’s an expensive 20 minutes. Many past participants have gone on to runway success.

David Rodriguez, who showed in the first class, dresses celebs like Heidi Klum and Kristen Dunst, and sells in Neiman Marcus and Nordstrom.

The exposure Alexandra Lind got at the spring 2000 show scored her a designing gig at Searle and space for her bridal collection in Bergdorf Goodman, where William Calvert’s gowns are also sold.

Bolstered by the critical acclaim she received for her show last season, Alice Roi is hosting her own tent show this season, as will Thomas Steinbruck.

Moet foots the whole bill. “All the designers have to do is produce the collection and show up,” a rep for the Champagne house explains.

She adds that models, makeup artists, hair stylists, front-of-house production staff, invitations and programs — and Champagne, of course — are provided.